基于LabVIEW的天线方向图测试系统设计

针对传统的天线方向图测量方法效率低、精度差的缺点,基于LabVIEW软件平台开发了1套天线方向图自动测试系统.该系统通过GPIB总线实现对测试仪器的控制,在信号录取、角度录取、数据处理、方向图绘制方面实现了完全自动化,具有精度高、测量速度快、性能稳定的特点.     

Optimal slip ratio estimator for traction control system of electric vehicle based on fuzzy inference

In this paper we propose an optimal slip ratio estimation method based on fuzzy inference. One of the major advantages of electric vehicles is the quick and precise torque response of the electric motor, which realizes a novel traction control system. To prevent skidding, optimal slip ratio control has been successfully developed. It maintains the slip ratio at the optimum value that gives the maximum driving force. The remaining problem is how to generate the optimal slip ratio command sent to the controller. First we show that effective estimation of the optimal slip ratio is difficult to perform by the simple gradient method, which is a well‐known optimization method. But various experimentally obtained data can be easily incorporated into fuzzy inference, and therefore its estimation performance can be easily improved by the accumulation of human experience. This is a major advantage in the nonlinear estimation of real road‐tire characteristics. The effectiveness of the proposed estimation and control methods is confirmed by numerical simulation. © 2001 Scripta Technica, Electr Eng Jpn, 135(3): 56–63, 2001     

A method for the conservative evaluation of safe space around systems with aperture antennas

In this work, a novel method is presented, with which the safe space around aperture antennas can be assessed. The basis of this new approach is the approximate similarity of the contours between uniformly and non-uniformly illuminated apertures. The isoparametric contours that result from numerical calculations have to be replaced by envelope contours that fully enclose them, in order to avoid radio frequency hazards. These envelopes were approximated with analytical formulas. Various examples of different apertures are presented, which demonstrate the mode of application and the validity of our method.     

左心室辅助装置控制系统的建模与仿真

提出一种采用无刷直流电动机设计的左心室辅助装置,通过对自然心脏的搏动规律的分析进行建模仿真.先采用传统PID控制,获得速度环的偏差、偏差变化率以及转速的数据,然后将这些数据在MATLAB的自适应神经模糊工具箱进行训练来设计模糊控制器.结果表明:训练后得到的模糊控制器要比传统PID控制器设计简单,控制响应速度快,鲁棒性好.     

自适应和模糊推理结合的故障分类新方法

输电线上许多类型的故障伴随低阻抗故障和高阻抗故障发生,传统的保护方法不能正确地检测和分类.提出了一种基于自适应网络的模糊推理机制(ANFIS)对低阻抗故障和高阻抗故障进行故障检测和分类的新算法.算法的性能已得到韩国典型的154 kV输电线系统在各种故障条件下的测试.测试结果表明ANFIS能在半个周期内准确地检测故障和区分故障类型(包括低阻抗故障和高阻抗故障).     

机载电子设备故障诊断专家系统的设计与实现

针对航空机载电子设备故障知识日益膨胀导致的故障诊断系统效率低下、难以快速有效地进行电子装备维护的问题,提出了一种新的、基于专家系统的机载电子设备故障诊断系统。分析了专家系统的原理和结构,研究了一般产生式规则与模糊产生式规则相结合的知识表示方法及精确推理与模糊推理相结合、基于规则推理、案例推理、模型推理及混合推理的推理机制。以Delphi7．0和Oracle9i为开发环境,开发了该专家系统。系统能快速分析故障现象,列出可能的故障原因,输出故障报告,提供故障处理指导。研究表明,新系统具有更高的效率、并且诊断结论也更可靠、可维护性也更好,在实际的航空机务维护工作中取得了良好的效果。     

Design and allocation of power system stabilizers using the particle swarm optimization technique for an interconnected power system

In this paper, three particle swarm optimization (PSO) based power system stabilizers (PSSs) are developed for three power systems. The system under study here is a power pool consisting of 3 power systems. System I represents the Egyptian power system, system II represents the Jordan and Syrian power systems, and system III for the Libyan power system, which are originally self standing and completely independent systems. As a matter of fact each of them should equipped with its own PSS. For this reason this work is started by designing an optimum power stabilizer for each of them standing alone. After which, the developed PSSs are firstly installed one at a time. Then the three PSSs are installed together in the interconnected power system and their effect on its dynamic performance is studied.As a test for stabilization efficiency, the detailed power system model is subjected to a forced outage of a 600-MW generator, which is the biggest unit in the pool, when it is fully loaded. This outage results in loosing of about 3% of the spinning capacity of system I and about 2% of the spinning capacity of the whole interconnected system. The obtained results show an improvement in the power pool performance accompanied with an improvement in the inter-area oscillation.     

Determination of the optimal DR capacity for a commercial building with chiller system and energy storage system

Demand response (DR ), which is used to shave the peak demand for securing supply reliability in a power system, is one of the promising constitutions for the end users. In a commercial building (COB ), the most popular adjustable DR resource (DRR ) is the chiller system. More specifically, its power consumption can be reduced by thermal mass control (precooling) in a specified DR duration. On the other hand, installation of energy storage systems (ESSs ) is going on at an accelerated pace because of its high economic efficiency. ESSs have been used for peak‐shift operation under the time‐of‐use (TOU ) tariff. However, ESS can be also used as an attractive DRR because it can reduce the net load by discharging the ESS for a specified DR duration. Based on this background, this paper presents a method for determining the optimal DR capacity in a COB with a chiller system and ESS . In the proposed scheme, the optimal DR capacity (kW ) can be determined so that the total expected cost of a COB becomes minimum by using the chiller system and ESS while avoiding the DR penalty threat adopted in the Korean DR market. Uncertainty in the ambient temperature, the amount of reduction, and DR durations are considered as the scenarios. The estimation and economic evaluation of the proposed scheme is ascertained through case studies. © 2017 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.     

感应电机速度和电阻自适应辨识的LMI方法(英文)

该文研究了一种感应电机无速度传感器模型参考自适应系统(model reference adaptive system,MRAS),提出一种新型的基于自适应磁链观测器的常数增益速度辨识方法。首先,运用李亚普诺夫(Lyapunov)稳定性理论设计出自适应磁链观测器及速度估算方法,通过MATLAB中的线性矩阵不等式(linear matrix inequality,LMI)工具箱求解线性矩阵不等式获得磁链观测器的增益矩阵,保证了此磁链观测器的稳定性,同时也克服了运用极点配置方法带来不稳定区域的问题。该文还研究了基于自适应观测器的电阻辨识问题。基于给出的自适应磁链估计方法,设计了感应电机无速度传感器直接转矩控制系统,并进行了MATLAB仿真和实验,结果表明,提出的无速度传感器速度方法在全速范围内具有很好的动态和静态性能。     

对空警戒雷达自动测试系统的设计与实现

对空警戒雷达在探测空中飞行目标,提供空中预警情报系统中发挥着重要作用。目前对对空警戒雷达的测试,主要采用传统的手动测量方法,工效低,且雷达多项功能参数无法测试。针对对空警戒雷达的测试保障现状,本文提出了基于虚拟仪器技术的对空警戒雷达自动测试系统的集成方案,详细描述了系统的功能和总体结构,提出了自动测试的过程控制策略,重点讨论了测试系统软硬件设计方案;实用证明,该系统精度满足要求,能完成预定测试工作,运行性能良好。     

蓄电池电驱动系统的匹配和优化

电驱动系统是电动自行车的关键,而蓄电池是电驱动系统的关键部件。指出,电驱动系统各部件之间的匹配和优化对于提高电动自行车的质量有着重要作用和意义。着重介绍了蓄电池和充电器之间的匹配和优化以及蓄电池放电深度与循环寿命之间的关系。     

电厂信息系统的规划与设计

随着信息技术在过程自动控制和生产经营管理等方面的广泛应用，使过程与管理信息成为全面反映电厂生产、经营和管理的一个重要窗口。如何利用这些信息为生产、经营和管理服务是电厂信息化的重要内容。阐述了电厂信息化的重点是对构成发电系统诸多设备的相关信息进行采集、存储、加工和利用，分析了国内在电厂信息系统建设方面与发达国家的差距，提出了电厂信息系统应该包括厂级监控信息系统(SIS)和管理信息系统(MIS)，应用系统和计算机网络不应根据专业进行划分。论述了信息系统的规划设计与控制系统设计和企业信息规划之间的区别，在给出电厂信息系统模型的基础上，提出了电厂信息系统中应包括的内容，指出电厂信息系统的规划设计需各专业的协调与配合，并根据各阶段的实际需要进行建设。     

A ubiquitous Web-based dispatcher information system for effective monitoring and analysis of the electricity transmission grid

Effective electricity grid management and planning necessitates widespread installation of convenient data acquisition modules to obtain the relevant grid data in a timely manner. In this paper, we describe a ubiquitous Web-based dispatcher information system deployed on the Turkish electricity transmission grid. This large-scale system is utilized by the transmission system operator to effectively monitor the transmission grid and to analyze and summarize the gathered data automatically, in order to take proper short-term and long-term operational decisions. The system has the additional facilities to produce load forecasts and track long-term investment plans on the electricity grid. The architecture of the implemented system is described in details together with the demonstration of sample significant analysis and forecast results obtained from the system.     

烟气脱硫装置石膏制备系统设计与设备配置

通过综合国内多项烟气脱硫装置工程设计特点,比照多种烟气脱硫装置石膏脱水系统设计方案,以2套360MW火电机组石灰石-石膏湿法烟气脱硫装置对应1套石膏脱水系统方式为例,设计石膏脱水系统并辅以设备配置。该系统设计具有运行方式灵活、可靠性好、能保证较高的装置投运率,设备配置备用性高、厂用电少,具有适应系统、简化系统、优化系统的特点,可满足系统简化、运行灵活、可靠,投入资金较低、连续运行、废水零排放的要求。     

基于LabVIEW的环境试验设备温湿度检定系统

为了实现对环境试验设备的检定,以LabVIEW为开发语言,Aligent34970A(配34901A模块)为数据采集器,RS232为通信方式,依据环境试验设备温度、湿度校准规范(JJF1101-2003),开发了环境试验设备温湿度检定系统;文章中讲述了系统的硬件组成和软件设计及数据采集、数据后续处理和系统的整体架构;并选用A级Pt100四线制铂热电阻检定环境温度,进行了升温、保温和测量阶段的实验,在Word中生成报表及校准结果,结果符合标准要求;该系统已在实际中得到应用,并取得了很好的效果。     

某型坦克自动装填故障自检系统的设计与开发

针对当前自动装填系统的故障检测都是离线检测,初步开发出1套完整的自动装填故障在线自动检测的系统.该系统通过对自动装填系统各部件的开关信号的采集,在便携式计算机上利用软件对采集到的信号数据进行分析处理,并建立自动装填系统运行状态的仿真环境,实现自动装填系统故障的在线检测.介绍了系统的总体设计方案,信号调理箱的设计与实现,...     

二代热像观瞄镜显示器／控制器的检测系统设计

在传统的方法中,对热像观瞄镜显示器／控制器的检测、调试、高低温试验和维修离不开热像头,由于被频繁开关机,严重影响其寿命,且其价格昂贵,大大增加了生产的成本和风险。因此,设计一套无热像头的热像观瞄镜显示器／控制器的检测系统是非常必要的。本文首先给出了系统设计的方案;然后依据此方案对系统的硬件电路进行了详细设计,对系统软件进行了设计和编写。最后,用该检测系统对热像观瞄镜显示器／控制器的功能进行了实际测试,测试结果验证了该系统达到了设计的目的。     

主从式微机给料系统的软硬件设计

现代化工业生产的领域中,具有计量功能的给料机在散状物料输送系统中的应用日渐增多.本文介绍了一种分布式数据采集与监控系统,阐述了系统的结构特点和工作原理,从软硬件方面进行了设计.将采集数据上传给控制中心的上位机时,采用MAX485接口转换芯片将RS232转换成RS485协议进行远距离传送.本装置具有操作方便、控制灵活可靠、人机界面友好等特点,在实际应用中也取得了良好的使用效果.     

杭州地区电力通信监控管理系统的建设

从提高电力系统通信运行管理水平的角度出发，建设先进、全面、实用、实时监控和专业管理并举的通信监控管理系统。对此，介绍了杭州地区电力通信监控管理系统硬软件方面独到的设计思路和特点。     

同步发电机整流系统的稳定性理论分析与数值计算

对具有反电势负载的同步发电机整流系统的静态稳定性进行了研究,建立了系统稳定性分析的电路模型,分析了系统在微扰条件下各量的变化情况,提出了系统稳定的判据条件,并对此进行了合理解释。通过实例分析对影响系统稳定性的参数进行了计算研究,绘制了系统稳定的参数范围曲线,分析解释了各种参数影响系统稳定性的原因,揭示了同步发电机整流系统的稳定性规律。